McASP Registers
22.4.1.28 Transmit Frame Sync Control Register (AFSXCTL)
The transmit frame sync control register (AFSXCTL) configures the transmit frame sync (AFSX). The
AFSXCTL is shown in
and described in
Figure 22-66. Transmit Frame Sync Control Register (AFSXCTL)
31
16
Reserved
R-0
15
7
6
5
4
3
2
1
0
XMOD
Reserved
FXWID
Reserved
FSXM
FSXP
R/W-0
R-0
R/W-0
R-0
R/W-0
R/W-0
LEGEND: R/W = Read/Write; R = Read only; -n = value after reset
Table 22-39. Transmit Frame Sync Control Register (AFSXCTL) Field Descriptions
Bit
Field
Value
Description
31-16
Reserved
0
Reserved. The reserved bit location always returns the default value. A value written to this field
has no effect. If writing to this field, always write the default value for future device compatibility.
15-7
XMOD
0-1FFh
Transmit frame sync mode select bits.
0
Burst mode.
1h
Reserved.
2h-20h
2-slot TDM (I2S mode) to 32-slot TDM.
21h-17Fh
Reserved.
180h
384-slot DIT mode.
181h-1FFh
Reserved.
6-5
Reserved
0
Reserved. The reserved bit location always returns the default value. A value written to this field
has no effect. If writing to this field, always write the default value for future device compatibility.
4
FXWID
Transmit frame sync width select bit indicates the width of the transmit frame sync (AFSX) during
its active period.
0
Single bit.
1
Single word.
3-2
Reserved
0
Reserved. The reserved bit location always returns the default value. A value written to this field
has no effect. If writing to this field, always write the default value for future device compatibility.
1
FSXM
Transmit frame sync generation select bit.
0
Externally-generated transmit frame sync.
1
Internally-generated transmit frame sync.
0
FSXP
Transmit frame sync polarity select bit.
0
A rising edge on transmit frame sync (AFSX) indicates the beginning of a frame.
1
A falling edge on transmit frame sync (AFSX) indicates the beginning of a frame.
3865
SPRUH73H – October 2011 – Revised April 2013
Multichannel Audio Serial Port (McASP)
Copyright © 2011–2013, Texas Instruments Incorporated